It is shown that the presence of a large number of abnormalities in welded joints is hazardous for safe operation of the system of main gas pipelines not only because of the probability of failure of the welded joints, but also because of formation of an additional factor, i.e. initiation and propagation of stress corrosion cracking defects in a zone of intersection of longitudinal and circumferential welds. The conclusions are: (1) A large number of abnormalities of the welded joints is hazardous for safe operation of the main gas pipeline system not only because of the probability of fracture of a welded joint, but also because of formation of an additional factor consisting in initiation and propagation of stress corrosion cracking (SCC) defects in the zone of intersection of longitudinal and circumferential welds. (2) IPFD is the most efficient method for prevention of emergency fractures of pipes in the extended multiline system of main gas pipelines.
Improvement of reliability of main gas pipelines by using repeated in-pipe flaw detection
The Paton Welding Journal ; 3 ; 20-25
2012
6 Seiten, 12 Bilder, 25 Quellen
Article (Journal)
English
Improvement in reliability of main pipelines. Paper 13
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